Webster's Revised Unabridged Dictionary · 1913

Irony

Irony , adjective

[From Iron.]

1.
Made or consisting of iron; partaking of iron; iron; as, irony chains; irony particles; -- In this sense iron is the more common term. [Rare] — Woodward
2.
Resembling iron in taste, hardness, or other physical property.

Irony , noun

[Latin ironia, Greek {not transcribed} dissimulation, from {not transcribed} a dissembler in speech, from {not transcribed} to speak; perh. akin to English word: compare French ironie.]

1.
Dissimulation; ignorance feigned for the purpose of confounding or provoking an antagonist.
2.
A sort of humor, ridicule, or light sarcasm, which adopts a mode of speech the meaning of which is contrary to the literal sense of the words.